1z0-071 Exam Dumps | Which two statements are true about the results of using the intersect operator in compound queries?

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Question 19/144

Which two statements are true about the results of using the intersect operator in compound queries?

A. intersect ignores nulls.

B. Reversing the order of the intersected tables can sometimes affect the output.

C. Column names in each select in the compound query can be different.

D. intersect returns rows common to both sides of the compound query.

E. The number of columns in each select in the compound query can be different.

Correct Answer: C,D

C . True, the names of the columns in each SELECT statement of an INTERSECT query do not need to match, as long as the data types and order of the columns correspond.
D . True, the INTERSECT operator returns only the rows that are common to both SELECT statements, effectively acting as a set intersection of the results from both queries.
Reference:
Oracle documentation on INTERSECT operator: Oracle Database SQL Language Reference Detailed behavior of INTERSECT: Oracle Compound Queries

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